Help With thread '<unnamed>' panicked at 'Requested resource bevy_render::MainWorld does not exist in the World.

[naomijub]

thread '<unnamed>' panicked at 'Requested resource bevy_render::MainWorld does not exist in the `World`.
                Did you forget to add it using `app.insert_resource` / `app.init_resource`?
                Resources are also implicitly added via `app.add_event`,
                and can be added by plugins.', C:\Users\jnboe\.cargo\registry\src\github.com-1ecc6299db9ec823\bevy_render-0.10.0\src\extract_param.rs:68:36
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'Compute Task Pool (7)' panicked at 'called `Result::unwrap()` on an `Err` value: RecvError', C:\Users\jnboe\.cargo\registry\src\github.com-1ecc6299db9ec823\bevy_render-0.10.0\src\pipelined_rendering.rs:136:45
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', C:\Users\jnboe\.cargo\registry\src\github.com-1ecc6299db9ec823\bevy_tasks-0.10.0\src\task_pool.rs:376:49
error: process didn't exit successfully: `target\release\vx_bevy.exe` (exit code: 101)

Error seems to be coming from the misconfigured PhaseItem. At Voxel/render/terrain_uniform.rs.

pub struct SetTerrainUniformsBindGroup<const I: usize>;
impl<P: PhaseItem, const I: usize> RenderCommand<P> for SetTerrainUniformsBindGroup<I> {
    type Param = SRes<TerrainUniforms>;

    fn render<'w>(
        _item: &P,
        _view: ROQueryItem<'w, Self::ViewWorldQuery>,
        _entity: ROQueryItem<'w, Self::ItemWorldQuery>,
        param: SystemParamItem<'w, '_, Self::Param>,
        pass: &mut TrackedRenderPass<'w>,
    ) -> bevy::render::render_phase::RenderCommandResult {
        pass.set_bind_group(I, param.into_inner().bind_group.as_ref().unwrap(), &[]);
        bevy::render::render_phase::RenderCommandResult::Success
    }

    type ViewWorldQuery = ();

    type ItemWorldQuery = ();
}

[hans-pistor]

Did some digging around in the bevy source code, you need to also add have subapp.add_system(extract_fn.in_set(RenderSet::ExtractCommands).in_schedule(ExtractSchedule))

The MainWorld resource will only be attach to the world when the ExtractSchedule is running: https://github.com/bevyengine/bevy/blob/v0.10.1/crates/bevy_render/src/lib.rs#L320

[naomijub]

Thank you

[pinkponk]

Thanks! This helped me aswell. in v.0.11 you can do
.add_systems(ExtractSchedule, fn_name)